Electrochemical characteristics of layered-spinel 0.7li2mno3·0.3li4mn5o12 composite powders with spherical shape and porous nanostructure

Chul Min Sim, Jung Hyun Kim, Young Jun Hong, Jung Kul Lee, Yun Chan Kang

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Layered-spinel 0.7li2mno3·0.3li4mn5o12 composite cathode powders are prepared by spray pyrolysis. Composite powders post-treated at temperatures below 800°C have spherical shapes and porous nanostructures. The BET surface areas of the composite powders decrease from 18.8 to 1.8 mm2 g-1 when the post-treatment temperature is increased from 550°C to 850°C. The composite powders post-treated at temperatures below 700°C have similar charge capacities due to the Mn3+/4+ redox reaction of the spinel component when they are initially charged to 4.5 V (about 41 mAh g-1). However, the initial charge capacities of the composite powders post-treated at 550°C, 600°C, 650°C, and 700°C are 203, 197, 166, and 105 mAh g-1, respectively, when they are charged to 4.95 V. The elimination of Li2O from the layered Li2MnO3 component is affected by the crystallite size of the Li2MnO3 phase as well as the grain size in the composite powders. The discharge capacities of the composite powders post-treated at 600°C increase from 220 to 263 mAh g-1 after 3 cycles. Then, the discharge capacities monotonically decrease to 201 mAh g-1 after 30 cycles.

Original languageEnglish
Pages (from-to)4850-4863
Number of pages14
JournalInternational Journal of Electrochemical Science
Volume8
Issue number4
Publication statusPublished - 2013 Apr
Externally publishedYes

Keywords

  • Cathode material
  • Composite material
  • Lithium battery
  • Spray pyrolysis

ASJC Scopus subject areas

  • Electrochemistry

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